Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39d4e2c6000298a5feee756ac20497c8a59659a823ed90b9ab9ec28c4d6df51' 
  AND token = 'R+AmDvAY1V6yzOkF4qOsu9vVUxy0z+ISnlkx/H9BanE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}